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go/doc/go1.17.html
Bryan C. Mills 7e00049b55 cmd/go: only add a 'go' directive to the main module when the go.mod file will be written
Then, write the 'go.mod' file with that version before further
processing. That way, if the command errors out due to a change in
behavior, the reason for the change in behavior will be visible in the
file diffs.

If the 'go.mod' file cannot be written (due to -mod=readonly or
-mod=vendor), assume Go 1.11 instead of the current Go release.
(cmd/go has added 'go' directives automatically, including in 'go mod
init', since Go 1.12.)

For #44976

Change-Id: If9d4af557366f134f40ce4c5638688ba3bab8380
Reviewed-on: https://go-review.googlesource.com/c/go/+/302051
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
2021-03-17 21:24:05 +00:00

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<!--{
"Title": "Go 1.17 Release Notes",
"Path": "/doc/go1.17"
}-->
<!--
NOTE: In this document and others in this directory, the convention is to
set fixed-width phrases with non-fixed-width spaces, as in
<code>hello</code> <code>world</code>.
Do not send CLs removing the interior tags from such phrases.
-->
<style>
main ul li { margin: 0.5em 0; }
</style>
<h2 id="introduction">DRAFT RELEASE NOTES — Introduction to Go 1.17</h2>
<p>
<strong>
Go 1.17 is not yet released. These are work-in-progress
release notes. Go 1.17 is expected to be released in August 2021.
</strong>
</p>
<h2 id="language">Changes to the language</h2>
<p>
TODO: complete this section
</p>
<h2 id="ports">Ports</h2>
<p>
TODO: complete this section, or delete if not needed
</p>
<h2 id="tools">Tools</h2>
<p>
TODO: complete this section, or delete if not needed
</p>
<h3 id="go-command">Go command</h3>
<h4 id="go-get"><code>go</code> <code>get</code></h4>
<p><!-- golang.org/issue/37519 -->
The <code>go</code> <code>get</code> <code>-insecure</code> flag is
deprecated and has been removed. To permit the use of insecure schemes
when fetching dependencies, please use the <code>GOINSECURE</code>
environment variable. The <code>-insecure</code> flag also bypassed module
sum validation, use <code>GOPRIVATE</code> or <code>GONOSUMDB</code> if
you need that functionality. See <code>go</code> <code>help</code>
<code>environment</code> for details.
</p>
<h4 id="missing-go-directive"><code>go.mod</code> files missing <code>go</code> directives</h4>
<p><!-- golang.org/issue/44976 -->
If the main module's <code>go.mod</code> file does not contain
a <a href="/doc/modules/gomod-ref#go"><code>go</code> directive</a> and
the <code>go</code> command cannot update the <code>go.mod</code> file, the
<code>go</code> command now assumes <code>go 1.11</code> instead of the
current release. (<code>go</code> <code>mod</code> <code>init</code> has added
<code>go</code> directives automatically <a href="/doc/go1.12#modules">since
Go 1.12</a>.)
</p>
<h2 id="runtime">Runtime</h2>
<p>
TODO: complete this section, or delete if not needed
</p>
<h2 id="compiler">Compiler</h2>
<p>
TODO: complete this section, or delete if not needed
</p>
<h2 id="linker">Linker</h2>
<p>
TODO: complete this section, or delete if not needed
</p>
<h2 id="library">Core library</h2>
<p>
TODO: complete this section
</p>
<h3 id="crypto/tls"><a href="/pkg/crypto/tls">crypto/tls</a></h3>
<p><!-- CL 295370 -->
<a href="/pkg/crypto/tls#Conn.HandshakeContext">(*Conn).HandshakeContext</a> was added to
allow the user to control cancellation of an in-progress TLS Handshake.
The context provided is propagated into the
<a href="/pkg/crypto/tls#ClientHelloInfo">ClientHelloInfo</a>
and <a href="/pkg/crypto/tls#CertificateRequestInfo">CertificateRequestInfo</a>
structs and accessible through the new
<a href="/pkg/crypto/tls#ClientHelloInfo.Context">(*ClientHelloInfo).Context</a>
and
<a href="/pkg/crypto/tls#CertificateRequestInfo.Context">
(*CertificateRequestInfo).Context
</a> methods respectively. Canceling the context after the handshake has finished
has no effect.
</p>
<h3 id="minor_library_changes">Minor changes to the library</h3>
<p>
As always, there are various minor changes and updates to the library,
made with the Go 1 <a href="/doc/go1compat">promise of compatibility</a>
in mind.
</p>
<dl id="net/http"><dt><a href="/pkg/net/http/">net/http</a></dt>
<p>
The <a href="/pkg/net/http/"><code>net/http</code></a> package now uses the new
<a href="/pkg/crypto/tls#Conn.HandshakeContext"><code>(*tls.Conn).HandshakeContext</code></a>
with the <a href="/pkg/net/http/#Request"><code>Request</code></a> context
when performing TLS handshakes in the client or server.
</p>
</dl><!-- net/http -->
<p>
TODO: complete this section
</p>